The Floaty Hydrometer integration has been removed from Brewfather device settings as of version 3.0.
Floaty is treated as a legacy integration in the current beta UI. The section in Settings → Power-ups only appears when Floaty is already enabled on your account.
Current behavior
If the Floaty section is visible, you can:
toggle it on/off,
copy the Floaty ID,
open (configure webhook),
open this page via See instructions.
If Floaty is already enabled
Open Settings → Power-ups.
Copy the displayed ID.
Configure your Floaty sender/app with that ID.
Start logging from Floaty.
In your batch, go to Fermentation → Devices and attach the Floaty device.